Pair-heating furnace and method of operating the same



I J. COSTELLO;

PAIR HEATING FURNACE AND. METHOD OF OPERATING T'HE SAME.

APPLICATION FILED DEC. I6, I919.

PatenteII May 17,1921.

3 SHEETSSI'IEET I.

INVENTOR WITN E55 ML ZK I. J. COSTELLO.

PAIR HEATING FURNACE AND METHOD OF OPERATING THE SAME.

1 APPLICATlQN. ElLED-DEC- 16,, I919.

WITNESS J. COSTELLO. v PAIR HEATING FURNACE AND METHOD 0F OPERATING THESAME.

APPLICATION FILED DEC. 16, I919.

Patented May 17,1921.

3 SHEETS-SHEET 3.

emi 01 s.

UNITED STATES PATENT oerice.

'.lHOMAS J. COSTELLO, orwnnnnn, OHIO.

Specification of Letters Patent. Patented lVIay 1'7, 1921.

Application filed. December 16, 1919. Serial No. 345,316.

To all whom it may concern:

Be it known that I, THOMAS J. COSTELLO,

a citizen of the United States, residing at Warren, in the county ofTrumbull and State of Ohio, have invented a new and useful Improvementin Pair-Heating Furnaces and Methods of Operatin the Same, of which thefollowing is a fu 1, clear, and exact description, reference being hadto the accompanying drawings, forming part of this specification, inwhich Figure 1 is a horizontal section of a pairheating furnaceembodying my invention.

Fig. 2 is a section on the line II-II of Fig. 1.

Fig. 3 is a section on the line IIIIII of Fig.4 is a longitudinalsection of one of the heating chambers showing. a different waly ofspacing the packs.

ig. 5 is a perspective view of one of the skid sections or bearers.

Figs. 6 and 7 are perspective views showing two different forms ofspacers, and

ig. 8 is a side view partly broken away showing another form of spacer.

My invention has relation to pair-heating furnaces for heating sheet andtin plate bars and is designed to provide a furnace of this character,together with a novel method of operating the same, whereby the packs ofbars may be more conveniently and economically handled and may be betterand more uniformly heated.

The nature of my invention will be best understood by reference to theaccompanying drawings in which I have shown a preferred embodiment ofone form of furnace and which will now be described, it being premised,however, that my invention may be carried out with other types offurnaces and that various changes may be made in the details ofconstruction, arrangement and combination of the'parts, withoutdepartingfrom the spirit and scope of my in-' vention as defined in theappended claims.

In the drawings I have shown my inven tion applied to a doublepair-heating furnace which is generally of th'well-known type. In thesedrawings then'umeralsfl'des ignate the heating chambers th furnace, 3the grates locate din lateral j nbustion chambers 4, 5 thestackputlets'; an 6=plush -i in mechanism of any well known" or usualcharacter lay mezin's' of 'wliic'h'tlie packs'of bars to be heated arepushed through the heatlng chambers.

In accordance with my invention I provrde the floor of each heatingchamber 2 w1th longltudinally arranged parallel skids or bearers 7 whichextend the full length of the heating chambers from the entrance endsthereof to the discharge ends, opposite the laterally arranged dischargedoors 8.

These skids or bearer features are preferably in sections arranged end.to'end. One

of the sections is illustrated in perspective in Fig. Each section ispreferably provlded wlth a dependlng lug or heel piece 9 at one endportion having the oblique face 10 adapted to be engaged by a securingwedge or key 11. These heel pieces or lugs engage recesses 12 formed inthe floors of the heating chamber, in which recesses the wedges or keys11 are also seated, these bemg permanently seated in said floors. Eachiece is formed at one end with a projectmg tongue 13 and 'with beveledends 14:, the latter being arranged to fit in the beveled recess 15 inthe other end of an adjacent section. The recesses 15 are extendedforwardly as shown at 16 to receive the tongue 13 of the adjacentsection. In this man; ner the skid or bearer sections are not onlysecurely held in proper alinement, but the sections may, when necessary,be readily removed and replaced. In the form-shown the sections areprovided with longitudinal grooves 17 extending from end to end, for thepurpose hereinafter described.

In accordance with my invention the bars to be heated are piled intopacks, in the manner shown in Figs. 1, 2 and 3, thesepacks extendingtransversely of the furnace and resting upon the upper surfaces of thebearers or skids 7 upon which they are pushed through the furnace. Inthe form shown in these figures, adjacent packs are spaced from eachother by suitable spacers. These spacers may take various forms. In theform shown in Figs? and 6, they consist of separate blocks, shown as ofeneral triangular form with depending eveled lugs "18 at their lowerends which are adapt- "nave-a sliding fit in the grooves 17 of "rls orbearers. Two of these spacers 'inployed'between each adjacent pair ofpirc ,"one engaging each of the skids or bearersflflln the form shown inFig. 7, the' spacers-are *ofT-shap' with lugs 19, similar to the lu s18, and adapted to engage the grooves 1 of the skids or bearers.

Fig. 8 shows another kind of bearer in the form of a transverse barhaving upwardly extending end portions 20. These bars rest and slideupon the skids or bearers with the upwardly extending portions lyingbetween the end portions of adjacent packs. In the arrangement shown inFig. 4 the spacing of the packs is effected by means of a number ofsheet bars A which are placed transversel on edge between the adjacentpacks B. prefer, however, to use spacers, such as shown in the otherfigures, because, with such spacers, provision is made fora bettercirculation of the heating medium between adjacent packs so that a moreuniform heating of the packs is obtained.

By placing the packs transversely of the heating chamber with suitableinterposed spacers, it will be readily understood that the packs may bereadily pushed through the heating chambers without danger of theirbuckling and unpiling. This method also avoids all difiiculties due tounequal lengths of the bars since the pushing action is always againstthe longitudinal edges of a plurality of bars, and not against the endsthereof. When thespacers such as shown in Figs. 6, 7 and 8 are employed,there is also afforded free space for the circulation of the heatingmedium between adjacent packs. I

give a space below the packs for heat circu-" In all cases, the skids orbearers lation. The skids can be raised to any desired extent, thusgiving substantially the same heating effect at both top and bottom.

Iclaim: j 1. The herein described method of heating sheet or tin platebars, which consists in piling separate barsflatwisein a i of packsextending transversely o a heating chamber, each pack contain n aplurality of bars, and pushing said-pac s through said chamber whilesubject to the action of the heating medium therein, substantially asdescribed.

2. .The herein described method of heating sheet or tin plate bars,which consists in piling separate bars in a plurality of packs extendingtransversely of the heating chamber, each pack containing a plurality ofbars, placing spacing means between adjacent packs, and pushing thepacks through said chamber while subject to the action of the heatingmedium, substantially as described.

3. The herein described method of heating sheet or tin plate bars, whichconsists in piling. the separate bars in a plurality of packs extendingtransversely of the heatingv chamber, each pack containing a pluralityof bars superimposed fiatwise upon each other, maintaining said packs inspaced relation, pushing the packs through the heat-.

plurality ing chamber, and heating them therein and direction from saidchamber, substantially as described.

4. The herein described method of heating sheet or tin plate bars, whichconsistsin piling separate bars fiatwise in a plurality of separatepacks extending transversely of the heating chamber, and spacing saidpacks longitudinally of each other by other bars piled edgewise betweenthe flatwlse 'plled packs, and pushing said bars through said chamberwhile subject to the action of the heating medium therein, substantiallyas described. g

5. A pair-heating furnace comprising a heatingchamber having parallelskids or bearers therein, and pack spacing devices having a guidingengagement with said skids or bearers, substantially as described.

6. A pair-heating furnace comprising a heating chamber having parallellongitudi- I with means for removablv securing the sections in the floorof the substantially as described.

8. A pair-heating furnace comprising a heating chamber having parallellongitudinally extending skids or, bearers formed in separatelyremovable inter-engaging sec-. tions, each of said sections having asecuring member engaging a recess in the floor of said chamber, and keyor wedge means engaging said member, substantially asde-. scribed. v g

9. A heating furnace comprising a heating chamber having longitudinallyextending parallel skids or bearers formed with longitudinal grooves intheir upper surfaces, and pack spacing members having means for engagingsaid grooves, substantially.- as deheating chamber,

, scribed.

L ing parallel skids or bearers, such skids or bearers being formed insections. the end portions of adjacent sections having an overlappinginterfitting engagement with each other, and said sections havingguiding means for pack spacers, substantially as described.

12. A heating furnace having parallel skids or bearers in the heatingchamber, said skids or bearers being formed in sections,

and the floor of said chamber having anchorsaid sections, substantiallyas described.

In testimony whereof, I have hereunto set my hand.

' ing means which are removably engaged by

